The molal boiling point constant is the ration of the elevation of boiling point to____________________?
Correct answer: B. Molality
- A. Molarity
- B. Molality
- C. More fraction of solvent
- D. Mole fraction of solute
Explanation
The molal boiling-point constant is defined by ΔTb = Kb m, so Kb = ΔTb / m, where m is molality in mol kg−1. Students may choose mole fraction because it is also used in colligative properties, but the term molal specifically requires molality.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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